function update(ctx){
    my.notify();
    for(num in my.ball_info){
	if(my.ball_info[num].hit != 1){
            var data = my.ball_info[num];
	    data.wcollision(data);
	    //data.bcollision(data,num);
	    data.move(data);
	    if(data.kind != "bomb"){
	        drawBall(ctx, currentAngle, data.x, data.y, data.z, data.scale, ctx.obj.REDCUBE);
	    }else{
		drawBall(ctx, currentAngle, data.x, data.y, data.z, data.scale, ctx.obj.ENEMY);
	    }
	}
    }
        // bombを吸い込んでいたらgame overを表示
        if(my.hit == 1){
	    drawBall(ctx, 0, 0,0,0, my.scale, ctx.obj.gameover);
	}
	drawBall(ctx, currentAngle, my.x,my.y,my.z, my.scale, ctx.obj.BIGCUBE);
}

function Ball(x,y,z,b_h, b_w, kind){
    this.x=parseInt(Math.random()*(width/2));
    this.y=parseInt(Math.random()*(height/2));
    this.z=z;
    this.h=b_h;
    this.w=b_w;
    this.scale = 1.0; // 大きさ
    this.kind =kind;
    this.dx=1.0
    this.dy=1.0
    this.hit=0;
    this.move=ballmove;
    this.other;
    this.wcollision = wallcollision;
    this.bcollision = ballcollision;
    return this;
}

function add_ball(x, y, z, h, w){
    my.ball_info.push(new Ball(x, y, z, h, w, "ball"));
}

function add_bomb(x, y, z, h, w){
    my.ball_info.push(new Ball(x, y, z, h, w, "bomb"));
}


function Myball(balls,m_h,m_w,e_r){
    this.x=0;
    this.y=0;
    this.z=0;
    this.h=m_h;
    this.w=m_w;
    this.e_r=e_r;
    this.scale = 1.0; // 大きさ
    this.dx=20.0;        // 初速度
    this.dy=20.0;
    this.hit=0;
    this.ball_info=balls;
    this.collision = mycollision;
    this.vacuum=vacuum;
    this.notify = ball_notify;
    return this;
}

// 子に対して、他の子の情報を更新する
ball_notify = function notify(){
    for(num in my.ball_info){
        var data = my.ball_info[num];
	data.other = my.ball_info;
    }
}

// 子に対して、他の子の情報を入れる
function ball_in(){
    for(num in my.ball_info){
        var data = my.ball_info[num];
	data.other = my.ball_info;
    }
}

// ボールの移動
ballmove = function Bmove(ball){
    ball.x += ball.dx;
    ball.y += ball.dy;
}

// 壁との当たり判定
wallcollision = function Wcollision(ball){
    const lim_x = width/2.0;
    const lim_y = height/2.0;
    if(ball.y <= -lim_y){
	ball.y = -lim_y;
	ball.dy = -ball.dy;
    }
    if(ball.y >= lim_y){
	ball.y = lim_y;
	ball.dy = -ball.dy;
    }
    if(ball.x <= -lim_x){
	ball.x = -lim_x;
	ball.dx = -ball.dx;
    }
    if(ball.x >= lim_x){
	ball.x = lim_x;
	ball.dx = -ball.dx;
    }
}

// 他のボールのとの当り判定
ballcollision = function Bcollision(ball,my_num){
    for(num in ball.other){
        if(num != my_num){
	    var data = ball.other[num];
            var k = ((ball.w*ball.scale) + (data.w*data.scale)) / 2.0;
	    var bx = ball.x-data.x;
	    var by = ball.y-data.y;
            var distance = Math.sqrt(Math.pow(bx,2) + Math.pow(by,2));

	    if(distance < k){
	        if((ball.dx * data.dx) < 0){
	            ball.dx = -ball.dx;
		}else if((ball.dy * data.dy) <0){
		    ball.dy = -ball.dy;
	        }else if(ball.dx > data.dx && ball.x < data.x){
		    ball.dx = -ball.dx;
		}else if(ball.dx < data.dx && ball.x > data.x){
		    ball.dx = -ball.dx;
		}else if(ball.dy > data.dy && ball.y < data.y){
		    ball.dy = -ball.dy;
		}else if(ball.dy < data.dy && ball.y > data.y){
		    ball.dy = -ball.dy;
		}
	    }
        }
    }
}

// 自機との当たり判定
mycollision = function Mcollision(){
    //var r = ((my.w + my.e_r) / 2.0 * my.scale) 
    for(num in my.ball_info){
        var data = my.ball_info[num];
	var r = ((my.w*my.scale) + (data.w*data.scale)) / 2.0 
        var bx = my.x-data.x;              // 2点間のx距離を求める
        var by = my.y-data.y;              // 2点間のy距離を求める
	var d = Math.sqrt(Math.pow(bx,2) + Math.pow(by,2));

        if(d < r){
                data.hit = 1;
	    if(data.kind == "bomb" && my.hit != 1){
		my.hit = 1;
	    }
        }
    }
}

// 吸引関数vacuum()
vacuum = function vacuum(){
    var range = 100;
    var suction = 3.0;
    for(num in my.ball_info){
        var data = my.ball_info[num];
	p_x = my.x-data.x;
	p_y = my.y-data.y;
        if(p_x > 0 && p_x < range){
	    data.x += suction;
	}else if(p_x < 0 && p_x > -range){
	    data.x += -suction;
	}
	if(p_y > 0 && p_y < range){
	    data.y += suction;
	}else if(p_y < 0 && p_y > -range){
            data.y += -suction;
	}
    }
}